Hydraulic elevator.



PATENTED JAN. 3l, 1905. V

No. 781,435.A

` T LARSSON HYDRAULIC ELEVATOR, v urmowrn FILED un'. 2, 19o4 l ghvcnbozl l @11 SHOM/mw UNITED STATES Patented January 31, l1905.

-lPATENT GEFICE.-

THURE LARssoN, OE WORCESTER, MASSACHUSETTS, ASSIGNOR To OE WORCESTER,MASSACHUSETTS, AND WILLIAM E. n. STORES, OE NEW YORK, N. Y.

i-nMsELE AND FRED. A. JONES,

HYDRAULIC ELEVATOR.v

SPECIFICATION forming part of Letters lPatent No. 781,435, dated January31, 1905. i

Appncaion nea January 2, 1904. 'serial Naiemsa To a/ZZ whom, t mayconcern:

Be it known that I, THURE LARssON, a subject of the King of Sweden andNorway, re-

siding at Worcester, in the county of VVorces-A ter and State ofMassachusetts, have invented` certain new and useful Improvements inHydraulic Elevators, of which the Afollowing is a full, clear, and exactspeciiication.'

This invent-ion relates to hydraulic elevators, and has for its objectto provide means for steadying the plunger as it travels up and down inthe cylinder.

In hydraulic elevators of the direct-plunger type where there isconsiderable rise the plunger on account of its length lis subject toconsiderable lateral vibration both within and Without the cylinder.This vibration is caused by the tendency of. the plunger to buckle, dueto its own weight, the weight of the load, and sudden starting andstopping. When the plunger is partly within the cylinder and partlywithout, the vibration setsup injurious strains upon the cylinder andits fastenings, and to overcomethis vibration I/propo'se to provide aresilient bearing for the lower end of the plunger which,.in connectionwith the vertical guides for the car, will prevent any vibration.

By leaving` the lower end of the plunger free thevibrations travel backand forth in a manner similar to astretched string; butby c`on-V fining'the plunger at both ends this cannot happen.

The inventionl will be more fully described in connection with' theaccompanying draw.

ings, in whichf- Figure 1'is a view, partly in section, Showing anelevator withthe invention. applied thereto. Fig. 2 is an enlarged viewof the lower end of the plunger. Fig. 3 is a cross-section on the line33 of Fig. 2; and Fig. 4c is a sectional viewof Fig. the cylinder. j

-1 represents the cylinder, having the usual supply and exhaust `pipe 2,connected with suitablevalves and a source of supply. 3 represents theplunger, having the socket 4t at its upper end secured to the Hoor 5 ofthe car 6.

2, showing a portion ofv 7. 7 are vertical guides for the car. 8 is-acable attached to the top of the car, leading over the shaft 9 andcarrying a counterweight 10. rIhese parts just mentioned may be of anydesired construction. The plunger 3 may be composed of` a number voftubular sections suitably attached together. The lower end of theplunger is closed by a plug 11, which has a reduced upperend or nipple12, threaded into the lower section of the plunger.

14 is a cable attached to the inside of the plug 11 and to the bodyofthe car. The cable is kept under a state of tension and serves toprevent the plunger from separating from the car and also to a certainextent to stiii'en it in connection withthe brushes. j The lower end ofthe plug llis reduced in diameter vand has a plurality of channels 15,closed by a collar 16 at the bottom. In the channels 15 are fastenedresilient brushes 17, which may be composed of stiff wires suitablyfastened in a back 18. The backs 18 are "^"fastened rigidly in thechannels 15 by fastening means, such as bolts 20, and may be readilyremoved for renewal, &c. rIhe brushes are rounded at each end, so astomove freely over `the joints of the cylinder, and are preferably 'ofsuchlength as to just escape contact with Vthe inside of the cylinder whenthe plunger is at rest centrally of the cylinder. tion, therefore, willcause the brushes to strike the side of the cylinder and by theirresiliency absorb the vibration and prevent injury to the 'cylinder orits fastenings. As the upper end of the Yplunger cannot vibrate onaccount of the *guides which engage theV car, the plunger will thusbecontined at both ends and the possibility of breakage 'or strainingreduced.

22 is a jacket which maybe fitted over the outside of the plug 11 tomake a iush joint with the lower tubular section.

l It will be observed that the brushes are so constructed that in casetheplunger exceeds its normal travel they can pass easily through Anyvibral der-head to be broken off.

I'do not restrict myself'to the speciiic construction of brushes which Ihave shown, and modifications and changes may be made without departingfrom the scope ofthe invention.

Having thus described my invention, I declare that what I claim as new,and desire to secure by Letters Patent, is-

l. In a hydraulic elevator, the combination with a cylinder, of aplunger connected with the car and having resilient means adapted toengage the interior of the cylinder, substantially as described.

2. In a hydraulic elevator, the combination with a cylinder, of aplunger having means at both ends for preventinglateral vibration, the

means at one end being resilient, substantially as described.

3. In a hydraulic elevator, the combination with a cylinder, of aplunger having means at both ends for preventing lateral vibration, themeans at the cylinder end being resilient and adapted to engage with theinterior of the cylinder, substantially as described.

4. In a hydraulic elevator, the combination with a cylinder, of aplunger connected with the car and having brushes adapted to engage theinterior of the cylinder, substantially as described.

5. In a hydraulic elevator, the combination with a cylinder, of aplunger connected with the car and having brushes adapted to engage withthe interior of the cylinder, said brushes being rounded, substantiallyas described.

6. In a hydraulic elevator, the combination with acylinder, of a plungerconnected with the car and having resilient brushes adapted to engagethe interior of the cylinder, substantially as described.

7. In a hydraulic elevator, the combination with a cylinder, ot' aplunger having its lower end reduced in diameter, and brushes carried onsaid reduced portion and adapted to engage the interior of the cylinder,substantially as described.

8. In a hydraulic elevator, the combination with a cylinder, of aplunger iitted therein, said plunger having resilient means` of largerdiameter adapted to engage theinterior of the cylinder, and also to passthrough the cylinder-head, substantially as described.

9. In alrvdraulic elevator, the combination oi' a cylinder containing aplunger, guides at the top for the upper end oi said plunger, means onthe lower portion oi the plunger adapted to bear against the insideofthe cylinder and also to pass through the stuiiingbox, substantiallyas described.

l0. Inahydraulicelevator, thecombination ot' a cylinder, a plungerengaging with guides at its upper portion, resilient means on the lowerportion engaging with the interior ol the cylinder, and means within theplunger for connecting its lower portion with the car, whereby vibrationof the plunger is prevented, substantially as described.

ll. In a hydraulic elevator, the combination of a cylinder and aplunger, and means ou the plunger adapted to engage the interior oi thecylinder, and to pass through the stuiiing-box, Y

substantially as described.

In testimony whereoil I aiiix my si gnature 1n presence of twowitnesses.

'IIIURIC LARSSON.

Witnesses JULIAN S. \Voos'r11u, GEORGE N. Kenn.

